Cubital Tunnel (Elbow Nerve)

Cubital tunnel syndrome is a pinched nerve at the elbow — second only to carpal tunnel syndrome for nerve-pinching conditions in the upper limb. The ulnar nerve — the one that gives you that funny bone zap when you knock your elbow — runs through a shallow bony groove behind the inner side of your elbow. Long stretches with the elbow bent (sleeping with arms folded, talking on the phone) or leaning your elbow on a hard surface can compress the nerve in that groove.

The earliest sign is numbness and tingling in your ring finger and small finger — especially noticeable when your elbow has been bent for a while (driving, sleeping with your arm folded under the pillow, holding a phone to your ear). The sensation often wakes you up at night. You may also feel an aching pain along the inner side of your elbow, right over the bony bump you call your funny bone.

As the compression worsens, the small muscles in your hand start to weaken. Grip strength drops, you may have trouble opening jars or turning keys, and in advanced cases you can see visible hollows between the knuckles on the back of your hand where the muscles have wasted (intrinsic atrophy). The ring and small fingers may begin to curl inward (claw posture), making it hard to straighten them fully.

Numbness and tingling in your ring and small fingers — especially when your elbow is bent for a while or when you press right on the nerve at the inside of the elbow. In advanced cases, the small muscles of the hand weaken and visibly shrink (you can see hollows between the knuckles). Your surgeon will tap over the cubital tunnel (Tinel's sign) and may hold your elbow in full bend for a minute (elbow flexion test) to try to reproduce your symptoms. If the diagnosis isn't clear-cut or surgery is being considered, EMG and nerve conduction studies confirm it and grade the severity.

1. NSAIDs

   NSAIDs like ibuprofen or naproxen for short-term relief during acute inflammatory flares.

Surgery (cubital tunnel release) is considered when symptoms persist despite a real trial of splinting and activity changes, when nerve studies show moderate-to-severe compression, or when the small hand muscles have started to weaken — that last one is a signal that waiting longer risks permanent loss.

External patient-education references and related OSI pages for additional background:

• Britannica — Joint (anatomy)
• AAOS OrthoInfo — patient education library
• OSI glossary — orthopedic terminology in plain language